diff --git a/ioping/telegraf-ioping.py b/ioping/telegraf-ioping.py
index 60e8083..1a3afda 100644
--- a/ioping/telegraf-ioping.py
+++ b/ioping/telegraf-ioping.py
@@ -118,9 +118,10 @@ def main():
 
     if args.mode == 'shell':
         returncode = ioping_output_shell()
-        
     elif args.mode == 'telegraf':
         returncode = ioping_output_telegraf()
+    else:
+        returncode = 1
         
     return returncode